Aluminum is always more frequently employed in automotive industries instead of the heavier iron-based alloys in order to gain advantages in terms of weight and increasing consequently the performance. This study aims to analyze, in partnership with Centro Ricerche Fiat S.C.p.A., the micrographic and mechanical characteristics of a set of two spots welded experimental alloys, never launched on the market, to understand if they can be ideal for future automotive applications. The thesis work is divided into a first bibliography part in which is illustrated the state of the art of aluminum components in car manufacturers, and a second research part describing all the tests executed on the welded specimens.